INTERFACE/SYNCHRONIZATION CIRCUITS FOR RADIO FREQUENCY RECEIVERS WITH MIXING DAC ARCHITECTURES

摘要

A receiver ( 1300 ) includes a mixing digital-to-analog converter (DAC) ( 1306 ), a direct digital frequency synthesizer (DDFS) ( 132 A) and an interface ( 134 D). The mixing DAC ( 1306 ) includes a radio frequency (RF) transconductance section ( 1308 ) and a switching section ( 1310 ). The RF transconductance section ( 1308 ) includes an input for receiving an RF signal and an output for providing an RF current signal The switching section ( 1310 ) is coupled to the RF transconductance section ( 1308 ) and includes inputs for receiving bits associated with a digital local oscillator (LO) signal and an output that is configured to provide an analog output signal. The DDFS ( 132 A) includes outputs configured to provide the bits associated with the digital LO signal to the inputs of the switching section ( 1310 ). The interface ( 134 D) is coupled to the DDFS ( 132 A) and is configured to align the bits provided by the DDFS ( 132 A) with a first clock signal